linux-kernel - Re: [PATCH v1] printk: add dummy vprintk_emit for when CONFIG

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Date:   Wed, 28 Aug 2019 12:02:31 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Brendan Higgins <brendanhiggins@...gle.com>
Cc:     shuah@...nel.org, pmladek@...e.com, sergey.senozhatsky@...il.com,
        rostedt@...dmis.org, kunit-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        frowand.list@...il.com, sboyd@...nel.org,
        Randy Dunlap <rdunlap@...radead.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH v1] printk: add dummy vprintk_emit for when
 CONFIG_PRINTK=n

On (08/27/19 16:48), Brendan Higgins wrote:
> Previously vprintk_emit was only defined when CONFIG_PRINTK=y, this
> caused a build failure in kunit/test.c when CONFIG_PRINTK was not set.
> Add a no-op dummy so that callers don't have to ifdef around this.
> 
> Note: It has been suggested that this go in through the kselftest tree
> along with the KUnit patches, because KUnit depends on this. See the
> second link for the discussion on this.

Is there any reason for kunit to use vprintk_emit()? Can you switch
to pr_err()/pr_info()/pr_foo()?

vprintk_emit() function is pretty internal. It's not static because
drivers/base/core.c wants to add some extra payload to printk()
messages (extended headers, etc).

	-ss